10 years as a corrections officer here and I agree with this!
I have never seen a single white inmate that impressed me ever slightly, however I have seen a few dozen over the years that looked like this guy (upper body wise). The vast majority of them only did "around the world", which is 10 sets of 15 pullups, 20 dips and 25 pushups, and ate crack head soups and tuna.
I was a CO in famous prison for two years before moving on for greener pastures. I remember the insane amount of guys in shape. We had a lot of professional fighters in our prison. Hurricane Carter, Dwight Muhammand Qawi and two other top pros. They had a boxing ring and I saw some brutal fights. They never used a referee that I saw.
Getting back to lifters they had a ton of basic weight back then. The body weight guys and the weightlifters both were well built. One guy at around 180lbs was doing a deep squat of around 700lbs with shower shoes. One white guy was really ripped with fantastic abs. He told me in prison he sleeps well at night and gets three square meals. He had nothing to do but work out. He told me once he gets out he reverts to drinking and drugs losing his build. Some of the black guys were true genetic freaks looking ripped and hard doing chin,dips, push ups and running.
One thing for sure the inmates were in much better shape than the majority of the corrections officers.